js删除json数据中指定元素

 delete 删除数组方法：

function removeJSONRows() {var tab = {"dataRows": [{"id": 1,"name": "使用部门"},{"id": 2,"name": "车辆走行路线"},{"id": 3,"name": "使用类别"}]}var rs = tab['dataRows'];for (var i in rs) {if (rs[i]['id'] === 2) {// delete 方法仅将数组中元素删除，数组空间位置还保留着，因此，删除后的数组长度依然为3。delete rs[i];}}console.log(rs);console.log(JSON.stringify(rs), rs.length);
}

----------------------------------------------------------------------------------------------------------------------

splice 删除数组方法：

function removeJSONRows() {var tab = {"dataRows": [{"id": 1,"name": "使用部门"},{"id": 2,"name": "车辆走行路线"},{"id": 3,"name": "使用类别"}]}var rs = tab['dataRows'];for (var i in rs) {if (rs[i]['id'] === 2) {// splice 方法将数组中元素彻底删除，删除后的数组长度为2。rs.splice(i,1);}}console.log(rs);console.log(JSON.stringify(rs), rs.length);
}

----------------------------------------------------------------------------------------------------------------------

filter 方法删除数组元素

function removeJSONRows() {var tab = {"dataRows": [{"id": 1,"name": "使用部门"},{"id": 2,"name": "车辆走行路线"},{"id": 3,"name": "使用类别"}]}// filter 删除等价于 splice 方法，彻底将元素从数组中清除掉。var rs = tab['dataRows'].filter((rows) => rows['id'] != 2);console.log(rs);console.log(JSON.stringify(rs), rs.length);
}